Was wondering if any body could please help me no one seems to be able to. i have a f550 frame with 980kv motors and 10x4,5 props. my hex weighs about 2kg all up gopro,gimbal,battery,etc . im using a 3cell 5000 mah battery. i only seem to get +- 5min flight time if that. not sure what to do? your help would be greatly appreciated.